Miao Wang commented on SPARK-18131:

I can try to follow this discussion for an initial PR.

> Support returning Vector/Dense Vector from backend
> --------------------------------------------------
>                 Key: SPARK-18131
>                 URL: https://issues.apache.org/jira/browse/SPARK-18131
>             Project: Spark
>          Issue Type: New Feature
>          Components: SparkR
>            Reporter: Miao Wang
> For `spark.logit`, there is a `probabilityCol`, which is a vector in the 
> backend (scala side). When we do collect(select(df, "probabilityCol")), 
> backend returns the java object handle (memory address). We need to implement 
> a method to convert a Vector/Dense Vector column as R vector, which can be 
> read in SparkR. It is a followup JIRA of adding `spark.logit`.

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